SFFS253 December 2021 TIC10024-Q1 , TIC12400-Q1
This section provides a failure mode analysis (FMA) for the pins of the TIC12400-Q1 and TIC10024-Q1. The failure modes covered in this document include the typical pin-by-pin failure scenarios:
Table 4-2 through Table 4-6 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.
Class | Failure Effects |
---|---|
A | Potential device damage that affects functionality. |
B | No device damage, but loss of functionality. |
C | No device damage, but performance degradation. |
D | No device damage, no impact to functionality or performance. |
Figure 4-1 shows the TIC12400-Q1 and TIC10024-Q1 pin diagram. For a detailed description of the device pins, see the Pin Configuration and Functions section in the TIC12400-Q1 or the TIC10024-Q1 data sheet.
Following are the assumptions of use and the device configuration assumed for the pin FMA in this section
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
IN13 | 1 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN14 | 2 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN15 | 3 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN16 | 4 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN17 | 5 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN18 | 6 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN19 | 7 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN20 | 8 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
AGND | 9 | No effect, this is the intended connected for this pin. | D |
IN21 | 10 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN22 | 11 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN23 | 12 | No device damage, this pin is meant to monitor a switch connected to GND. The switch input will be unable to determine state change. | B |
IN0 | 13 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN1 | 14 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
/CS | 15 | Chip select will always be in an active state, and SPI communication will not be possible. | B |
SCLK | 16 | The system clock will stuck in a logic-low state, disabling the ability to latch data into the shift register from the SI pin, and not allowing SO data to be available to the controller. | B |
SI | 17 | The SI pin will be stuck in a logic-low state not allowing for any data from the controller to be sent through SPI to the TIC12400-Q1. | B |
SO | 18 | The SO pin will be stuck in a logic-low state not allowing for communication from the TIC12400-Q1 to the controller to happen. | B |
VDD | 19 | The supply for the SPI communication will be at GND, disabling SPI communication. | B |
CAP_A | 20 | The internal analog LDO will no longer have output capacitance causing the LDO to be unstable, and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. | B |
RESET | 21 | The device will be permanently in normal operation, so a hardware reset will not be possible. | B |
CAP_PRE | 22 | The internal pre-regulator for both the analog and digital LDOs will no longer have output capacitance. This will cause the pre-regulator to be unstable and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. | B |
CAP_D | 23 | The internal digital LDO will no longer have output capacitance causing the LDO to be unstable, and the internal supply rail will be stuck at 0V. Excessive current will also flow from VS to GND. | B |
/INT | 24 | The interrupt function will be stuck low, not able to indicate any interrupts including if a switch state changed. | B |
IN2 | 25 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN3 | 26 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN4 | 27 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
DGND | 28 | No effect, this is the intended connected for this pin. | D |
IN5 | 29 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN6 | 30 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN7 | 31 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN8 | 32 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN9 | 33 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN10 | 34 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN11 | 35 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
IN12 | 36 | No device damage, if configured to monitor a switch connected to battery and the switch is closed, battery will be shorted to GND which may cause excessive current draw from VS. | B |
VS | 37 | The main chip supply of the device will be at 0V, and excessive current draw from the VS power supply would occur. | B |
VS | 38 | The main chip supply of the device will be at 0V, and excessive current draw from the VS power supply would occur. | B |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
IN13 | 1 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN14 | 2 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN15 | 3 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN16 | 4 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN17 | 5 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN18 | 6 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN19 | 7 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN20 | 8 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
AGND | 9 | Device unpowered. | B |
IN21 | 10 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN22 | 11 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN23 | 12 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN0 | 13 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN1 | 14 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
/CS | 15 | The SPI controller will not be able to engage the chip select for SPI on MSDI. No SPI communication possible. | B |
SCLK | 16 | The SPI controller cannot drive the clock signal to correctly sample SPI communication. No SPI communication possible. | B |
SI | 17 | The SPI controller cannot send SPI data to the TIC12400-Q1. No SPI communication possible. | B |
SO | 18 | The TIC12400-Q1 cannot send SPI data to the SPI controller. No SPI communication possible. | B |
VDD | 19 | SPI power supply unpowered, SPI communication will not work, but rest of device will still function correctly. | B |
CAP_A | 20 | The internal analog LDO will have no connection to the output capacitor for stability. Internal analog LDO will not work correctly. | B |
RESET | 21 | No controller will be able to drive the reset function on the device. Reset functionality will not be usable. | B |
CAP_PRE | 22 | The internal pre-regulator will have no connection to the output capacitor for stability. Internal pre-regulator will not work correctly. | B |
CAP_D | 23 | The internal digital LDO will have no connection to the output capacitor for stability. Internal digital LDO will not work correctly. | B |
/INT | 24 | External interrupt indication is not available. Controller connected to the TIC12400-Q1 will not be indicated of any interrupts asserted by the TIC12400-Q1. | B |
IN2 | 25 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN3 | 26 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN4 | 27 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
DGND | 28 | Device unpowered. | B |
IN5 | 29 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN6 | 30 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN7 | 31 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN8 | 32 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN9 | 33 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN10 | 34 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN11 | 35 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
IN12 | 36 | The switch detection input will not be able to detect if the switch state has changed. Loss of functionality, but no damage. | B |
VS | 37 | Device unpowered. | B |
VS | 38 | Device unpowered. | B |
Pin Name | Pin No. | Shorted to | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|---|
IN13 | 1 | IN14 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN14 | 2 | IN15 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN15 | 3 | IN16 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN16 | 4 | IN17 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN17 | 5 | IN18 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN18 | 6 | IN19 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN19 | 7 | IN20 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN20 | 8 | AGND | No device damage, IN20 is meant to monitor a switch connected to GND. IN20 will be unable to determine state change on the connected switch. | B |
AGND | 9 | IN21 | No device damage, IN21 is meant to monitor a switch connected to GND. IN21 will be unable to determine state change on the connected switch. | B |
IN21 | 10 | IN22 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN22 | 11 | IN23 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN23 | 12 | IN0 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN0 | 13 | IN1 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN1 | 14 | /CS | Potential pin damage if IN1 is monitoring a switch connected to battery and the switch is closed. The /CS absolute maximum could be violated. | A |
/CS | 15 | SCLK | /CS would engage and disengage over and over if SCLK is being serviced by the clock signal from the SPI controller. SPI communication would not be useable. | B |
SCLK | 16 | SI | SPI communication into the TIC12400-Q1 would not be useable, as the input would be a clock signal that could not be read by the TIC12400-Q1. | B |
SI | 17 | SO | SPI communication would not be functioning with both the input from the controller and the output to the controller communicating the same information. | B |
SO | 18 | VDD | SPI communication from the TIC12400-Q1 to the controller would not be possible because it would be stuck in a logic high state. | B |
CAP_A | 20 | RESET | If RESET is driven high, the internal analog LDO has the potential to become unstable. | B |
RESET | 21 | CAP_PRE | If RESET is driven high, the internal pre-regulator has the potential to become unstable. | B |
CAP_PRE | 22 | CAP_D | No failure effect, but the effective capacitance at both outputs will be a different value. | C |
CAP_D | 23 | /INT | If /INT is pulled up externally, the internal digital LDO has the potential to become unstable. | B |
/INT | 24 | IN2 | No device damage, but IN2 will be unable to determine state change on the connected switch, and /INT will not be able to properly indicate a switch state change on another INx input or any other interrupt asserted by the TIC12400-Q1. | B |
IN2 | 25 | IN3 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN3 | 26 | IN4 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN4 | 27 | DGND | No device damage, IN4 is meant to monitor a switch connected to GND. IN4 will be unable to determine state change on the connected switch. | C |
DGND | 28 | IN5 | No device damage, IN5 is meant to monitor a switch connected to GND. IN5 will be unable to determine state change on the connected switch. | C |
IN5 | 29 | IN6 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN6 | 30 | IN7 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN7 | 31 | IN8 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN8 | 32 | IN9 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN9 | 33 | IN10 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN10 | 34 | IN11 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN11 | 35 | IN12 | No device damage, both pins have the same function. If they are shorted together, they won't be able to differentiate between the different switches connected to either pin. The state of the switch may not be known. | B |
IN12 | 36 | VS | No device damage, IN12 is meant to monitor a switch connected to battery. IN12 will be unable to determine state change on the connected switch. | B |
VS | 37 | VS | No effect, these pins have the same function. | D |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
IN13 | 1 | No device damage, but the switch input will be unable to determine state change. | B |
IN14 | 2 | No device damage, but the switch input will be unable to determine state change. | B |
IN15 | 3 | No device damage, but the switch input will be unable to determine state change. | B |
IN16 | 4 | No device damage, but the switch input will be unable to determine state change. | B |
IN17 | 5 | No device damage, but the switch input will be unable to determine state change. | B |
IN18 | 6 | No device damage, but the switch input will be unable to determine state change. | B |
IN19 | 7 | No device damage, but the switch input will be unable to determine state change. | B |
IN20 | 8 | No device damage, but the switch input will be unable to determine state change. | B |
AGND | 9 | The device will be unpowered, potential for high current draw on the VS supply. | B |
IN21 | 10 | No device damage, but the switch input will be unable to determine state change. | B |
IN22 | 11 | No device damage, but the switch input will be unable to determine state change. | B |
IN23 | 12 | No device damage, but the switch input will be unable to determine state change. | B |
IN0 | 13 | No device damage, but the switch input will be unable to determine state change. | B |
IN1 | 14 | No device damage, but the switch input will be unable to determine state change. | B |
/CS | 15 | Absolute maximum violation, SPI chip select may be damaged. Unable to communicate through SPI. | A |
SCLK | 16 | Absolute maximum violation, SPI clock may be damaged. Unable to communicate through SPI. | A |
SI | 17 | Absolute maximum violation, SPI input to the TIC12400-Q1 may be damaged. Unable to communicate through SPI | A |
SO | 18 | Absolute maximum violation, SPI output from the TIC12400-Q1 may be damaged. Unable to communicate through SPI | A |
VDD | 19 | Absolute maximum violation, SPI supply pin will be damaged. Unable to communicate through SPI. | A |
CAP_A | 20 | Absolute maximum violation, internal analog LDO may be damaged. | A |
RESET | 21 | Absolute maximum violation, device RESET pin and function may be damaged. | A |
CAP_PRE | 22 | Absolute maximum violation, internal pre-regulator may be damaged. | A |
CAP_D | 23 | Absolute maximum violation, internal digital LDO may be damaged. | A |
/INT | 24 | No deivice damage, but external indication for a switch input changing state will no longer be available while short is present. | B |
IN2 | 25 | No device damage, but the switch input will be unable to determine state change. | B |
IN3 | 26 | No device damage, but the switch input will be unable to determine state change. | B |
IN4 | 27 | No device damage, but the switch input will be unable to determine state change. | B |
DGND | 28 | The device will be unpowered, potential for high current draw on the VS supply. | B |
IN5 | 29 | No device damage, but the switch input will be unable to determine state change. | B |
IN6 | 30 | No device damage, but the switch input will be unable to determine state change. | B |
IN7 | 31 | No device damage, but the switch input will be unable to determine state change. | B |
IN8 | 32 | No device damage, but the switch input will be unable to determine state change. | B |
IN9 | 33 | No device damage, but the switch input will be unable to determine state change. | B |
IN10 | 34 | No device damage, but the switch input will be unable to determine state change. | B |
IN11 | 35 | No device damage, but the switch input will be unable to determine state change. | B |
IN12 | 36 | No device damage, but the switch input will be unable to determine state change. | B |
VS | 37 | No failure, this is the intended use for this pin. | D |
VS | 38 | No failure, this is the intended use for this pin. | D |
Pin Name | Pin No. | Description of Potential Failure Effect(s) | Failure Effect Class |
---|---|---|---|
IN13 | 1 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN14 | 2 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN15 | 3 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN16 | 4 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN17 | 5 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN18 | 6 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN19 | 7 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN20 | 8 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
AGND | 9 | Supply to SPI will be at ground, SPI will be unpowered. SPI communication not possible. | B |
IN21 | 10 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN22 | 11 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN23 | 12 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN0 | 13 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN1 | 14 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
/CS | 15 | The SPI chip select pin will be stuck in the logic high state. SPI communication cannot be enabled. | B |
SCLK | 16 | The SPI clock will be stuck in a logic high state. SPI data will not be able to be clocked in. SPI communication will not be possible. | B |
SI | 17 | SPI communication from the controller to the TIC12400-Q1 would not be possible because the data in would be stuck in a logic high state. | B |
SO | 18 | SPI communication from the TIC12400-Q1 to the controller would not be possible because it would be stuck in a logic high state. | B |
VDD | 19 | No effect, this is the intended use of this pin. | D |
CAP_A | 20 | Internal analog LDO will be biased to VDD voltage. No device damage but LDO may become unstable. | C |
RESET | 21 | RESET pin will be stuck in a logic high state, keeping the device in a hardware reset state. All functionality will be lost. | B |
CAP_PRE | 22 | Internal pre-regulator will be biased to VDD voltage. No device damage but pre-regulator may become unstable. | C |
CAP_D | 23 | Internal digital LDO will be biased to VDD voltage. Device damage possible, and LDO may become unstable. | A |
/INT | 24 | Interrupt pin will be stuck high and unable to externally indicate a switch input state change. | B |
IN2 | 25 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN3 | 26 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN4 | 27 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
DGND | 28 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN5 | 29 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN6 | 30 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN7 | 31 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN8 | 32 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN9 | 33 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN10 | 34 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN11 | 35 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
IN12 | 36 | No device damage, but logic voltage bias would interfere with the switch input sensing. | C |
VS | 37 | Potential absolute maximum violation on VDD pin, SPI supply pin will be damaged. Unable to communicate through SPI. | A |
VS | 38 | Potential absolute maximum violation on VDD pin, SPI supply pin will be damaged. Unable to communicate through SPI. | A |